Recording mechanism



Sept. 15, 1925.

S1 B. WILLIAMS, JR

RECORDINGKMECHANI'SM Filed Oct. 26, 1922 50m Ue/ [fi M//Y//dms Jr.

Sept. 15, 1925. 1,553,346

` s. B. WILLIAMS, JR

RECOVRDING MECHANISM Filed oct. 2e. 1922' 2 sheets-sheet 2 mf f APatented Sept. 15, 1925.

omen siarrs PATENT o1-*Fica Bumm. n. manuals, .'m, or saooxnnr, Nawironic,A Assieme rov waaraan mme- TRIO COMPANY, INCORPORATED, 0F

YORK.

NEW your, N. g., A' Conrolwrrol or maw RECORDING MEOHANIBI.

Application tied October 28, 1922. Serial' No. 598,988.A

To all 'whom it ma" camera.'

Be it known that SAMUEL B. WILLIAMS, Jr., a citizen of the ll'nitedStates residin at Brooklyn, in the county of Kings an State of New York,have invented certain new and useful Im rovements in RecordingMechanismao which the following is a full, clear, concise, and exactdescription.

This invention relates recording and selecting mechanisms and moreespecially to such mechanisms when adapted to telephone exchangesystems.

The object of the invention is an improved recording and selectingequipment compris in? a plurality ot counting devices euch ses' re aysoperative in response to impulse series representing designations.

A feature of the invention relates to a series of counting relays'arranged :lor successive operation, a plurality ci said relays eachreleasingon operation of the succeed-a in saigd relays being operatedremains operated until a plurality ol succeeding relays are actuated.

Such other features as are contemplated the present invention willbecome more b cllearly understood from the 'following' deright of t iisfigure, there is also illustrated,

in schematic form, an additional register for recording another part oithe designation.

In telephone systems el' the'autoinatic and semi-automatic type, it issometimes desirable to register on apparatus at the central oilice, thedesignation ot the wanted line or circuit. rlhis registration serves togovern the selective operations of switches to extend the requiredconnection or tor controlling the operation 'of indicating mechanismrelay and wherein a particular one oil pulse receiving1 and recordinwhich enable an operator toextend or complete the desired call. yIt isin a system of this general character that the recording mechanismembodying the features of ap licants invention is particularly useful.bviously, however, the invention is applicable in its broadest aspectstolany system wherein it is desired to establish a record by means ofdesignation impulses.

In the system disclosed, the subscribers llnes, such as lines 100 and101, extend to the central oce and terminate in a line switch 1.02,diagrammatically shown. Th

ing line to envoi a number of trunks, one oit which., truiih` 103, 10d,is illustrated leading to a drst selector switch 100. Switch 10h may beoit the same character as the j line switch l02 is adaptedto extend thecalli line switch.l 1 0@ and has tor its function to n, extend .theinsomnie trunks to outgoing.

trunks. Several of the outgoing trunks 107, 108, 109, M0, lli and i12are illustrated.

bv'iously, theseoutgoing trunlrsymay lead to succeeding?,r selectiveswitch devices where they are a ain selectively connected to othertrunks an so on untill the connection is coin plated. a

Also, located at the central odios is an iinmechanism comprising anorganisation o' relays and circuits, the functional which is to receivethe impulses transmitted from the calling line and record thedesignations represent` ed bthese impulses. There me be any de sire'number oil recording mec anisrns loi,n serving a group of' subscribersparticular one to he taken :ter one time depending upon its 'busy ,or iecondition. 1 selective switch 13.05 is providedior associatingp an idleone el the4 recording mechanisms with a particular trunlr lot, 104i towhich the calling subscribers line has been connected. 1

'lhe switches 102, 106 and 105 may be ot the coordinate ty e suchas'generally shown and 'described in etail'in the atent to S. iB.Williams, No.`1,til7,331, issue December 2. 19241. For an understandinol one method et controlling switches of t iis character in atelephonesystem, reference is made to the circuit descriptions found insaid patent to S.v B. lllillianis.A Furthermore, these switches may be.ot any well knownand apgli proved type, such as power driven selectorsor selectors in which multi-contract relays are employed, for buildingup connections with means `for selecting and operating the ries ofimpulses transmitted over the line which are received by the countingrelay set 126 shown in Fig. 1 and recorded successively on therespective registers 200 and 201 shown in Fig. 2. When the. callingsubscriber initiates the call by removing is receiver from theswitchhook, the line switch 102 operates to extend the line 100 to anidle trunk 103, 104. Moreover, the selecting switch 105 operates toassociate the idle recording mechanism shown with the selected trunk103, 104. In response to these operations, a circuit is closed frombattery over conductor 147, resistance 117, left-hand l winding of imulse relay 115, through concuit from batte tacts of the se ector switch105, trunk conductor 104 through contacts ofy the line switch 102 overthe subscribers line 100 and returning through the contacts of lineswitch 102, trunk conductor 103, contacts of the selector switch 105,through the balancing coil 118 to ground. Relay 115 operates and at itsright contact closes a circuit for the slow-torelease relay 119. .Relay119 at its left contact, applies ground potential to the holdingconductoi` 146, for maintaining the various relays operated. Relay 119also closes a cirthrough the resistance 116, right-hand win ing of relay120 to ound at the right contact of relay 119. Relay 1.20, however, doesnot operateA in this circuit so long as relay 115 remains ener ized tomaintain the following shunt at around the right-hand winding of re ay120: battery, through the resistance 116, left contact of relay 115,left contact of relay 119 to ground.

When the subscriber operates his transmitter 150 to send two impulsesconstituting the first series, the impulse relay 115 deenergizes twicein succession. On the first deenergization of relay 115, the shuntcircuit around relay 120 is opened and this relay immediately operates.lRelay 120 locks momentarily in a circuit from battery, through itsleft-hand winding and inner left contact, outer right back contact ofrelay 12'1 to ground over conductor 146. Relay 120 also closes a circuitfrom battery through the left-hand winding of rela 121 to ground at theinner right contact o relay 120. Relay 121 .operates and locks in acircuit from battery, through 4its. right-hand winding and inner rightcontact to the grounded conduc resistance of this relay 127 a circuitfrom battery through the winding of slow-to-release relay 122, upperback contact of relay 123, upper contact of relay 124, conductor 146 toground at the left contact of relay 119. Relay 122 operates in thiscircuit and is held in the following circuit after relay 123 becomesenergized: battery, through the winding of relay 122, outer right frontcontact of relay 121 to the grounded conductor 146.

When relay 121 is operated at the beginning 'of the first impulse of theseries it closes a circuit from battery through its left-hand windingand left contact, conduc-A tor 148, outer right back contacts of count-`ing relays 136, 135, 134, 133, 132, 131, 130, 129, 128 and 127.inseries, winding of relay 127, left back contact of relay 128, conductor151, lowermost vcontact of relay 124, upper front contact of relay 123,upper back .contact of relay 124, to the grounded conductor 146. Relay127, however, does not olperate in this circuit since itis shunted b t edirect path previously traced through the left-hand winding of relay 121to ground at the inner rig'ht contact of relay 120. At the end of thefirst impulse, the line circuit is closed, relay 115 operates andreplaces the shunt around relay 120 and this latter relay becomesdeenergized. Relay 120 on deenergizing, opens the shunt around thecounting relay 127 and relay-127 operates.

It should be noted at this point that the armatures and contactsof thecounting relays 127 to 136, inclusive, are so designed that the innerright armature of each of .these relays makes-connection with`- itscontact slightly in advance of the time that the outer ,right-handarmature disengages its back contact. By. this arrangement, the innerright-hand armature of relay 127, for example, closes its front contactbefore the olperatmg circuit of said relay is opened at t e outerright-hand armature and back contact.

Relay 127 locks in `a circuit traceable from battery, throughtheresistance 125, lnner right armature and contact and winding of relay127, left back contact of relay 128, vconductor 151, lowermost) contactof relay'124, upper front contact of relay 123 upper` contact of relay124 to the grounded conductor 146. y

When the relay 120 releases at the termination of the impulse andremoves the shunt around the winding of relai 127, the is t rown in lment with its contact and maintains thls enbatter? series, with theleft-,hand winding of relay 121. The increase of resistance causesy acorresponding decrease in the current flow through the left-hand windingof relay 121.- Immediately following, the inner righthand armature. ofrelay 127 makes engagegae'ement for an interval before the outerright-hand armature disengages its back contact. During the intervalmentioned, the left-hand winding of relayf121 is shunted by the holdincircuit above traced from ,througv resistance 125 and the vrindirg orelay 27 to round. The shunting e ect produces a sti l further reduction1n the flow of current in the left-hand Winding of relay 121. At the endof 'the interval,

the outer right-hand armature and back cont-act of relay 127 opencompletely the circuit through the left-'hand winding of relay 121.

The windingslcf relay 121 are arranged differentially lwith respecttoeach other. The magnetic flux set up by the left-hand winding issulicient to maintain the arma tures attracted in opposition to themagnetic flux set up by the right-hand winding, even when the flow ofcurrentthrough said lefthand winding has been reduced as abovedescribed. However, a double reduction of current through the left-handwinding of relay 121 decreases the resultant flux to such an extent thatwhen the circuit through the left-hand winding is completely open, the

relay due to its diierential character, re-

leases quickl Thus, at t e end of the first impulse, relay 127 isenergized and locked depending lon the back contact of relay 128, relay120 is deenergized and relay 121 is also released. The relays 119 and122 have their circuits intermittently opened and closed during theseries of impulses, but, being slow-to-release, they maintain theirarmatures attracted durino' these brief interruptions.

When the secondkand last impulse oi the series is received, relay 115releases and relay 120 is again operated. Relay `120 com- Aletes thecircuitabove described for the eit-handwinding of relay 121 and thislatter relay attracts its armatures. Relay 121 in operating, reclosesthe circuit of relay 122 and also completes a path :from battery throughits left-hand winding and leit contact, conductor 148, outer right backcontacts of counting relays 186 down to 128 inclusive, outer right frontcontact of relay 127, windingl of relay 128, outer left contact of relay129 tothe grounded conductor 151. Relay 128, however, does not operateat this time due to the shunt maintained at the inner right contact ofrelay 120. At the end of the second impulse, relay 120 becomesdeenergized and removing the shunt permits the counting relay 128 tooperate in series With the left-hand winding of relay 121.

Relay 128 locks in a circuit from, ...battery through the resistance 125inner-right front contact of relay 128, windin of said relay, outer leftback contactof re ay 129 to the grounded conductor 151. Relay' 128 atits eft back contact opens the circuit of relay 127 and this latterrelay releases In the manner already described, relay 128 causes adouble reduction in the How of current throu h the left-hand winding ofrelay 121 and a so o ns this circuit thereafter to permit the re ay 121to release. y After theusual interval has expired following the\frstseries of impulses, relay 122 having its circuit opened, retracts itsarmature. Relay 122 completes a circuit from ground over the conductor146 through its contact, lower front contact of relay 123, inner llowercontact of rela -124, conductor 144, left back contact of re ay 205,winding of, relay 204, to batte Relay 204 o crates and closes a circuitIiiom battery, t rou! h its winding and right contact, conductor 1 5,winding of relay 124, lower contact of relay 123, contact of relayconductor 146. Relay 124 does not operate in this circuit since it isshunted by the original operating circuit for the relay 204. Relay 204at its left contacts extends the conductors from the counting relaysthrough to -the relays 206, 207, 208 and 209 oi' register Since thesecond countin relay 128 is operated, representing the rst digit of thedesignation, a circuit is completed :from

ground over the conducotor 151 as abovev traced through the. left 'frontcontact of relay 128, conductor 142, next to the outermost left contactof relay204, winding of register relay 208 to battery, Relay 208operates and locks in a circuit from battery through its winding andinner left colhtact to ground over conductor 146. Relay 208 establishesa circuit from ground over conductor 146 through its 'outer leftcontact, winding of relay 205 to battery. Relay 205I` at its left' backcontact opens the shunt around relay 124 and this latter relay operatesin series with relay 204. Relay 124 at its lowermost contact opens theholding circuit oi:D relay 128 permitting this relay to release. Relay124 at its upper contact, opens the holding circuit of relay 128. Relay123 releases and in so doin opens the circuit of relays 124 and 204.impulse receiving mechanism and relay '204 becomes deenergized todisconnect the counting relay set 126 from the register rela s 200. Thesubscriber now manipulates his dial 150 to transmit a series of threeimpulsesv 122, to ground over' elay 124 releases, restoring the lastimpulse is transmitted, the relay 121 opfront contact of relay 128,winding of re ay 129, left back contact of r'ela 130, to ground overconductor 151. It wil be noted that relay .123 operates and locks on thefirst impulse of the second series in the manner already explained.Relay 129 in operatin closes a locking circuit to battery througresistance 125, innerright contact of relay `129, left back contactofrelay 130 to ground over conductor 151. Relay 129 at its outer leftback contact opens the circuit of relay 128 and this latter relaydeenerglzes.

After a suiiicient interval has ela sed following the second series ofim u es, the slow relay 122 again releases an a circuit is closed fromground over conductor 146, contact ofrelay 122, lower contact of relay123, inner lower contact of relay 124, conductor 144, left front,contact of relay 205, conductor 220, left back contact of relay 212,winding ofrela 213, to battery. Relay 213 operates and c oses a circuitfrom battery through its winding and right contact, conductor145,`thence as above traced through the winding of rela 124 to thegrounded conductor 146. Re ay 124 being shunted does not operate untilthe relay 212A attracts its armature at a later time. Relay 213 at itsleft contacts extends the control conductors from the counting relays126 through to'the'relays 214, 215, 216 and 217 of t e second re ister201.

Since t e third counting relay 129 is operated in response to the secondseries of impulses, a circuit is closed from the ground ed conductor 151through the outer left front contact of relay 129, conductor 143,outermost left contact of rela 213, winding of the relay 214 to battery.elay 214 o crates and locks in a circuit from battery t rou hA itswinding and inner left `contact to t grounded conductor 146. Stillanother circuit is established from 'ground over ,onductor 151, throughthe inner left contact of 7 relay 129, conductor 142, next to theoutermost back contact of relay 213, winding of( 2 register relay 216 tobattery. Relay 216 actuates and locks through its windin vand inner leftcontact to the grounded con uctor 146, Relay 212 is -now energized inthe following circuit: battery, through the winding of relay 212, Vouterleft contacts of relays 214 and 216 in parallel to the groundedconductor 146. Relay 212 locks through its right contact to theconductor 146. Relay 212 at its left back contact opens the shunt aroundrelay 124 and relay 124 energizes in series with relay 213. Relay 124opens the aua-sm lays 127, )128 and 129 have been operat circuit ofrelay 123 which in turn releases a 6B and opens the circuit of relays124 and 213. Relay 213 disconnects the counting relay set 126 from theregister relay 201.

In a lmanner identical to that described,

other series of impulses may be transmitted over the calling linerepresenting other digitsr ofthe designation which are received andrecorded upon succeeding registers similar to those shown in Fi 2. -Athird re ister- A 203 is schematically illustrated in whic the relay 219corresponds 'to relays 205 and 212 l of the iirsttwo registers. y

The varlable settings of these registers represent the diierent digitsof the wanted designation and circuits controlled by said registers maybe closed in a manner well known in the art for determining theselective operations of the switches. v For example, the register 200,201, etc., may determine the selection of the magnets 113, 114,

etc., to choose the required tinks outgoing from the switch 106 as shownin the patent to S. B. Williams, o. 1,517,331, issued December 2, 1924.

When the last digit has been recorded on the register, a circuit maybeclosed for the relays 210 and 218 in any desired Inan-A ner asillustrated in the said patent .to S. B. Williams. Relays 210 and 2,18merel serve to apply groun ferent contacts of the re ister relays todetermine theselection 0% n connection with the register 200,theselecting circuit leads from ground througl the contactof relay 210,right front-contact cfg relay 208, inner right back contact of rela 206,innermost left back contact of relay 207 to the selecting conductor 252.

For the register 201,'the selecting circuit 105 i may be traced fromground through the inner contact ofI relay 218, right front contact ofrelay 216, innermost right front contact of relay 214, next tothe innerleft back contact-of relay 215 to the selecting conductor 253. In asimilar manner, the selecting circuits for the remainin relay registers(not shown) are alsocomp eted. Inasmuch as the present invention relatesmore articularly to the arrangement and functions of the counting relaset shown in Fi 1, it has not been consi ered necessary to illustrate indetail the method of control which the several registers exercise over'the potential to the di 95 4 the circuit re y resented by the setting of`the registers.

switches. In fact, as already explained, any 12 ofthe well known methodswherein autooperations of the counting relays, a descripi 1 :,ssaaeetion will now be given of the apparatus in mitted, rela 121 on operatingat the beresponse to series of impulses representing the remaining sevendigits.

Assume that a series of four impulses is received. The o ration is thesame as already described or the first three impulses.

U on receipt of the fourth and last impulse o the series, relay 121operates andcloses a circuit from `battery through its left-hand Windingand left contact, conductor 148, thence through the outer right backcontacts of relay 136 tol 130 inclusive, outer r1 ht front contact ofrelay 129, winding ofre ay 130, left back contact of relay 131 to oundover `conductor 151. At the end of t ,e 1mpulse when relay 120 releases,relay 130 opkcrates and locks throu hits inner right ttl lili

contact andalso causes t e release of relay 121. Relay 130 at its' 'leftbac-k contact, opens the circuit of relay 129.

If a series of five impulses are trans- ,mittech the fiith impulsecauses in the manner explained, the' operation of relay 121.. Relay 121closes the circuit alcove traced through its left-hand Winding andcontact, thence over conductor 1118 through the outer right contacts ofrelays 136 to 131, inclusive, outer right iront contact of relay 130,Winding of relay 131, left hack contact ot relay 133, conductor 151, toround. At the end oi the impulse when re ay 120 releases, relay 131operates and in turn. causes the release o1 relay 121. Relay 131 becomeslo-clred in a circuit from battery through resistance 13'?, inner rightcontact and Winding ofrelay 131, left back contact of rela its lett hachcontact opens. the circuit o1 relay 130 and this latter releases. n

lt a series ot sin impulses are transmitted, the relay 121 in energizingon the beginning of the sinth impulse completes a circuit from batterythrough its lett hand Wind-- in and lett contact, conductor 118, outerle t hack contacts oi relays 136 to 132 inclusive, outer right irontcontact et rela 131, Winding of relay 132, lett hach contact 'overconductor 151. At the end of the ener ined.

ot relay 133, to the grounded conductor 151. At the end o1 the im ulse,relay 120 releases,

and removing the s' unt, permits relay 132 to operate in series with thelett winding ol relay 121. Relay 132 causes the deenergiaing o1 relay121in the manner described. lt should loe noted, however, that relay 1.32in operating does notcause the preceding' relay 131 to release as hasheen the case up to this point. Thus, at the end ot a series ol siximpulses both relays 131 and 132 are energized and locked. The lockingcircuit tor relay 132 may he traced from battery through the resistance138, inner right con tact and winding of .relay 132, left back contactof. relay 13.3 to the grounded conductor 151.

When a .Series at .Saves impulses are impulse, relay\ 120 releases andpermits relay 133 to operate in series with relay 121. Relay 133 causesthe relay 121 to re ease and" also closes a locking circuit for itselfas follows: battery, through resistance 138, inner right contact andwindin of relay 133, outer left back'contact of re ay 134 to the oundedconductor 151. Relal 133 at its eft back contact o ns the ho dingcircuit of rela 132. 'Relly 132 releases. lt will loe no ,that relay 131still remains ien a series of eight impulses are transmitted, relay 121in operating on the eighth impulse closes a circuit, similar to thatalready doscribed, for the counting relay 134s Relay 134 operates at theend o the eighth impulse and, closes a locking circuit for itselttromloattery, through resistance 133, inner ri ht contact and winding otrelay 131, left ack contact oi? relay 135 to ground over conductor 151.Relay 134 at its outer lett hach contact savers the holding circuit otrelay 133. Relay 133 releases lout relays 131 and 134i remainsenergized.

Should the subscriber send a series o1 nine y impulses, the relay 121 inoperatingon the 133, conductor 151 to ground. Relay 131 at.

ninth `hnpulse completes Nan analogous cir? cuit for the nent counting1relay .135. lite llay 133 operates at the end ot the impulse and closesa holding circuit tor itself from battery through the resistance 133,inner `right contact and Winding out relay 135, left 'hach contact ot"relay 133 to ground over conductor 131. Hela 135 causes the release o1relay 121 an also opens at its lett l hach contact, the holding circuitof relay 1311. Relay 131 deenergiaes and relays 131 and 135 remainlocked.

ll a series et ten im ulses are transmitted, the relay 121 respondin tothe last im ulse closes a cirmit from f attery throng its leithandWinding and contact,4 conductor 113, outer right contact of relay 136outer ri ht :iront contact o1 relay 135, Winding of re ay 133 to oundover conductor 151. At the end oi e impulse` when relay 120 releases,relay 133 o rates and causes the deenergiaation of re ay 121 in themanner explained. Relay 136 closes a locking circuit from batterythrough the resistance 138, inner right contact and winding of relay 136to the grounded conductor v151. Bela 133 at its left back contact opensthe hol ing circuits of relays 185 and 131. Thus at the end of a Seriofteu impulses, rela 'j ble showing the counting relays operated, 4

136 remains ene and all relays are releasdd.ad

From inspection, it -will be observed that the several Arelays of theregisters 200, 201, etc., are operated in different combinations whendi'erent ones of the counting relay set 126 are energized. The following'is a tatheconductors grounded, and the register relays `of the register200 energized for the several series o impulses:

i Number impulsen Coun Islam l Conductors -grounded mid m ttig ianssssssssas It may be noted that the `first register 200 is arranged to.automaticall erase the digit 1 in order to guard against the recordingof -an accidental impulse. This is accom lished b making the ockingcircuit of re ay 206 ependent upon the energization of either one ormore of the relays 207, 208 andv 209. If a single impulse is sent, therelay 206 operates in response' thereto, AlAiu-tsince neither of thethree relays is opera-ted and since relay 2.05 cannot lock the relay 206releases immediately that 'the counting relays become deenergized thedigit 0 as is the casein the other registers. Therefore an additionalrelay 211 is provided `for recording the digit 0 lor ten impulses.`Referring' to' the next -register 2 01, since the relay 212 onceenergized always remains energized until the equipment is released, thisrelay may therefore be used for 'recording/the digit 0. When tenimpulses are transmitted, the relay 212 'responds thereto and locks ltothe grounded conductor 146. In this case, none of the otherI for relays214, 4215,- 216 or 217 is operated. Accordingly, a `circuit may bevtraced for the zero operating lead through back contacts of these fourrelays.

When the recording mechanism is no longer required, the circuit or relay115 is opened as by. releasing the switch 105 and -precedin p means w ena particular one of said series of relays is o erated lfor maintainingsuch releasing a number of sai ductor 146 and all energized relays inthe controlling and ne 'ster circuits'are released. What is claime is:

1. In combination, a series of relays arranged to operate successivelyin res' onse to a series ofimpulses, a plurality Io .said relays eachhaving means for releasing the relay when it is operated, and

relay operate `until a plurality of Asucceeding relays have' beenoperated. 2. In combination, a series of counting rclays arranged tooperate successively in respense to -a series of impulses, means forrelays while impulses are being received, and means when .a particularone of said series of-relays is operated for maintainin said relay oerated until a plurality o succeeding 're ays are operated and released.

f 3. -In combinationa series of counting rclays arranged to operate oneafter another in response to a series of impulses, a number of saidrelays each having means for releasing the preceding relay when it isoperated, means when a certain one of said series of relays is operatedfor maintaining said relay operated during the operation of a pluralityof succeeding relays, and means for releasing said certain relay when aparticular succeedimir relay is operated. l

4. In combination, a single series of counting relays arranged to beoperated one after the other in response to a series of impulses, eachof a certain number of said relays arranged to release upon thctermination of the impulse causing the energization of the nextsucceeding relay, and means when a `particular one of said series ofrelays is operated for maintaining su'ch relay operated until aplurality of succeeding relays have been operated and released.

.5. In combination, a series of counting rclays arranged to be operatedin succession in response to a series of impulses, each of a number ofsaid relays having means for releasing the preceding relay when it isoperated, means for releasing a particular one of said series of relaysonly after a pluralit of succeeding relays have been operated, an aselection controlling device controlled by said relays.

6. In combination, a series of coiuiting relays arranged to operatesuccessively, a differential relay responsive to series of impulses forcausing the operation of said counting relays, each of a plurality ofthe counting relays having meansfor releasing the preceding relay whenit is operated, and

means when a particular one ci the series of relays is o erated tomaintain such relay means'when a particular one of the series operateduntil a plurality of succeeding re. yof relays is operated to maintainit operated lays havebeen operated, said differential reuntil aplurality of succeeding relays are. lay having two windings one of whichis operated, and registers set4 by said series of 5 controlled by saidcounting relays. relays to lestablish registrations.

7 ln combination, a series 'of relays ar- `lln witness whereof, Ihereunto subscribe ranged to operate successively in response my namethis 24th day of October, A. D. to a'series of impulses, each of aplurality 1922.

of said relays having means for releasing 10 the preceding relay when itis` operated, SAMUEL B. WILLIAMS, JR.

